Page 1 of 4 1234 LastLast
Results 1 to 10 of 40

Thread: A4000D PSU Replacement Questions

  1. #1
    Retro Girl Staff Moderator SkydivinGirl's Avatar
    Join Date
    Dec 2008
    Country
    USA
    Region:
    Raleigh, NC
    Age
    46
    Posts
    7,482
    Feedback
    185 (100%)

    Default A4000D PSU Replacement Questions

    I created a new topic so we don't continue hijacking Kin's Thread.

    Quote Originally Posted by Ruud

    @Heather
    Have you found one that fits well in the case without mods? I really want to eliminate the noise my A4k makes as well.

    @Kin
    Sorry for the highjack, good luck with the sale
    Quote Originally Posted by keropi


    BEWARE!!!!!

    most mATX psu's don't have a strong enough +5v line, be sure to get a sufficient Amps one!

    @Ruud

    I picked up a Blue Star 325W mATX PSU. From my measurements, it's very close to the same width at the A4000D power supply but only about half as tall. I'm sure I'll have to do something for air flow, but I'll figure it out.

    @keropi

    What's good amperage for the +5v line? This one is 28A.

    Take care,

    Heather
    Promoted to Level II Solder Tech and Hackery Padawan

  2. #2
    Mega AmiMod
    Staff Moderator
    keropi's Avatar
    Join Date
    Dec 2007
    Country
    Greece
    Region:
    Ioannina
    Age
    40
    Posts
    7,302
    Feedback
    149 (100%)

    Default Re: A4000D PSU Replacement Questions

    28A ? then it is OK!
    I tried to replace the PSU on my Grex4000 a4000 , I had bought 3-4 mATX psu's ~2 years ago... they had ridiculous +5v amps , and the amiga malfunctioned, especially in AGA gfx intensive games...
    One great game to test stability is the ECS whdload version of KID CHAOS. If it runs OK without GFX errors, then there is enough psu juice



    Aacheron and slk486 are my heroes
    A1200D mfilos ed. : ACA 1231/42 , Indivision MK2 , IDEfix Express , Subway , PicoPSU 120w custom 3.9 ROM/OS

  3. #3
    Retro Girl Staff Moderator SkydivinGirl's Avatar
    Join Date
    Dec 2008
    Country
    USA
    Region:
    Raleigh, NC
    Age
    46
    Posts
    7,482
    Feedback
    185 (100%)

    Default Re: A4000D PSU Replacement Questions

    Phew! Glad to hear the PSU I bought should be enough. I'll definitely let you know how it works out with Kid Chaos.

    Take care,

    Heather
    Promoted to Level II Solder Tech and Hackery Padawan

  4. #4
    Amiga fanboy VIP
    Amibayer!
    rkauer's Avatar
    Join Date
    Dec 2007
    Country
    Brazil
    Region:
    São Leopoldo, RS
    Age
    53
    Posts
    11,967
    Feedback
    110 (100%)

    Default Re: A4000D PSU Replacement Questions

    To get better airflow in the A4000 PSU, first thing to do remove the back grill (stupid thing!) and replace it with a black metal mesh of your choice and a rubber contour for better finishing. Not recommended to the faint of heart or people without intimacy with a Dremmel tool.

    Also swapping the original noisy fan with another silent unit or even an Evercool temperature-controlled one will do wonders for silence and reliability of the (new or not) supply.

    Il dig some pictures from Motorollin, an old Amiga.troll member and a nice guy.

    Marking the case for cutting:


    Front cutting where after you'll need to install a fan grill:


    Back cutting:


    Final back result:


    Notice the guy also made some lateral plexiglass cut-outs that are mere cosmetic, normal mod don't need that!
    David Bradley made Ctrl+Alt+Del, Gates turn it mandatory
    16 Amigas at home :D
    3x C= 64 :smile:
    1 VIC-20 :smile:
    8 PC (argh) :thumbsdown: at least one is an AROS/Amithlon unit

  5. #5
    Amiga fanboy VIP
    Amibayer!
    rkauer's Avatar
    Join Date
    Dec 2007
    Country
    Brazil
    Region:
    São Leopoldo, RS
    Age
    53
    Posts
    11,967
    Feedback
    110 (100%)

    Default Re: A4000D PSU Replacement Questions

    Another possible modification, but this time from another guy that replaced the entire PSU with
    a common unit and replaced the back panel with hard card board!

    Not elegant as the Moto's approach, but functional:

    David Bradley made Ctrl+Alt+Del, Gates turn it mandatory
    16 Amigas at home :D
    3x C= 64 :smile:
    1 VIC-20 :smile:
    8 PC (argh) :thumbsdown: at least one is an AROS/Amithlon unit

  6. #6
    Mega AmiMod
    Staff Moderator
    keropi's Avatar
    Join Date
    Dec 2007
    Country
    Greece
    Region:
    Ioannina
    Age
    40
    Posts
    7,302
    Feedback
    149 (100%)

    Default Re: A4000D PSU Replacement Questions

    here is my approach on the matter:









    I never really finished it, I just bought 3 LiteON A4000D PSU's that have a 2A stronger +5v line...
    Aacheron and slk486 are my heroes
    A1200D mfilos ed. : ACA 1231/42 , Indivision MK2 , IDEfix Express , Subway , PicoPSU 120w custom 3.9 ROM/OS

  7. #7
    Amiga fanboy VIP
    Amibayer!
    rkauer's Avatar
    Join Date
    Dec 2007
    Country
    Brazil
    Region:
    São Leopoldo, RS
    Age
    53
    Posts
    11,967
    Feedback
    110 (100%)

    Default Re: A4000D PSU Replacement Questions

    Mate, to finish your hack/mod all you need is a piece of metal.

    But as it is you have a nice niche to store some part while moving the computer around...

    Or a safe place to hide money from wife!
    David Bradley made Ctrl+Alt+Del, Gates turn it mandatory
    16 Amigas at home :D
    3x C= 64 :smile:
    1 VIC-20 :smile:
    8 PC (argh) :thumbsdown: at least one is an AROS/Amithlon unit

  8. #8
    Amiga fanboy VIP
    Amibayer!
    rkauer's Avatar
    Join Date
    Dec 2007
    Country
    Brazil
    Region:
    São Leopoldo, RS
    Age
    53
    Posts
    11,967
    Feedback
    110 (100%)

    Default Re: A4000D PSU Replacement Questions

    OK, one last mod. This one is a slightly better approach to replacing the original unit. But with slightly poor finishing.

    David Bradley made Ctrl+Alt+Del, Gates turn it mandatory
    16 Amigas at home :D
    3x C= 64 :smile:
    1 VIC-20 :smile:
    8 PC (argh) :thumbsdown: at least one is an AROS/Amithlon unit

  9. #9
    Mega AmiMod
    Staff Moderator
    keropi's Avatar
    Join Date
    Dec 2007
    Country
    Greece
    Region:
    Ioannina
    Age
    40
    Posts
    7,302
    Feedback
    149 (100%)

    Default Re: A4000D PSU Replacement Questions

    I abandoned the project due to weak +5v lines of the mATX psu's of the era... instead I did that ti LiteOn psu's I got:





    or this:

    Aacheron and slk486 are my heroes
    A1200D mfilos ed. : ACA 1231/42 , Indivision MK2 , IDEfix Express , Subway , PicoPSU 120w custom 3.9 ROM/OS

  10. #10
    Mega AmiMod
    Staff Moderator
    keropi's Avatar
    Join Date
    Dec 2007
    Country
    Greece
    Region:
    Ioannina
    Age
    40
    Posts
    7,302
    Feedback
    149 (100%)

    Default Re: A4000D PSU Replacement Questions

    awesome! I used the same thermometer to cover the empty space in my latest A4000D mod, to help airflow !

    here is some older pic, nothing changed, only the useless media-card-reader was replaced with the thermometer




    here is the extra space gained:




    and here a replaced PSU fan and a copper 50gr heatsink on the ppc:

    Aacheron and slk486 are my heroes
    A1200D mfilos ed. : ACA 1231/42 , Indivision MK2 , IDEfix Express , Subway , PicoPSU 120w custom 3.9 ROM/OS

Page 1 of 4 1234 LastLast

Similar Threads

  1. Battery replacement
    By AndyLandy in forum AmiOracle
    Replies: 12
    Last Post: 13th November 2009, 21:39
  2. RTC battery replacement
    By RedDaemonFox in forum AmiOracle
    Replies: 6
    Last Post: 18th October 2009, 16:04
  3. Closed WTB: A4000D Replacement Motherboard
    By Nathanieltolbert in forum Found Archive
    Replies: 2
    Last Post: 1st June 2009, 00:04
  4. A3640 Capacitor Replacement for Scrappysphinx
    By TheCorfiot in forum Photo Booth
    Replies: 19
    Last Post: 2nd May 2009, 23:20

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •